body{
    background-color: #F44F60;
}
h4{
    text-align: center;
    line-height: 3rem;
    font-size: 2rem;
    font-family: "华文彩云";
    color: white;
}
#container img.logo{
    width: 20rem;
    height: 15rem;
    margin: 0px 20% 0px 20%;
}
#container #btns{
    width: 80%;
    margin:0 auto;
}
#container #btns button{
    width: 80%;
    line-height: 2.5rem;
    margin: 0 10% 1rem 10%;
    border-radius: 0.5rem;
    font-size: 1.5rem;
    font-family: "楷体";
}
#container #btns button:nth-of-type(1){
    border: 2px solid skyblue;
    color: skyblue;
}
#container #btns button:nth-of-type(2){
     border: 2px solid darkorchid;
     color: darkorchid;
 }
#container #btns button:nth-of-type(3){
    border: 2px solid chartreuse;
    color: chartreuse;
}